Rubicon Adapter: Add multiple sizes to sizeMap (prebid#4407)

Author: ACannuniRP

modules/rubiconBidAdapter.js

@@ -44,6 +44,7 @@ var sizeMap = {
   39: '750x100',
   40: '750x200',
   41: '750x300',
+  42: '2x4',
   43: '320x50',
   44: '300x50',
   48: '300x300',
@@ -88,8 +89,11 @@ var sizeMap = {
   199: '640x200',
   213: '1030x590',
   214: '980x360',
+  221: '1x1',
   229: '320x180',
   232: '580x400',
+  234: '6x6',
+  251: '2x2',
   257: '400x600',
   264: '970x1000',
   265: '1920x1080',